fix: pass provider name to interceptors instead of hardcoding it

[ssncferreira]

Problem

Interceptors hardcode the provider name for API dump and trace attributes. The chatcompletions and responses interceptors always used "openai", and the messages interceptor always used "anthropic". For Copilot, since it uses the OpenAI interceptor, this meant that requests were dumped to the openai/ directory and traced as provider=openai instead of copilot.

Changes

• Add providerName parameter to all interceptor constructors
• Replace hardcoded provider constants with the passed provider name in API dump and trace attributes
• Providers pass p.Name() when constructing interceptors
• Add Copilot API dump integration tests verifying dumps land in the correct copilot/ directory

Related to: #152

Disclaimer: initially produced by Claude Opus 4.6, heavily modified and reviewed by @ssncferreira .

[ssncferreira]

• feat: validate duplicate provider names in NewRequestBridge #240
• fix: pass provider name to interceptors instead of hardcoding it #238 👈 (View in Graphite)
• feat: add Type() to Provider interface and configurable instance Name #237
• main

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[ssncferreira]

Merge activity

• Mar 31, 2:32 PM UTC: A user started a stack merge that includes this pull request via Graphite.
• Mar 31, 2:34 PM UTC: Graphite rebased this pull request as part of a merge.
• Mar 31, 2:35 PM UTC: @ssncferreira merged this pull request with Graphite.